Lifting mechanism



NOV. 15, 1927. 1,649.574

W. J. CONWAY LIFTING MECHANISM Filed Feb. 18, 1926 2 Sheets-Sheet lgmmcm 501',

Nov. 15, 1927. 1,649,574

w. J. CONWAY LIFTING MECHANISM Filed Feb. 18. 1926 2 Sheets-Sheet 2 SEMship and placed in the water, it being Patented Nov. 15, 1927.

umrso STATES m I. CONWAY, OF SAN FRANCISCO, CALIFORNIA.

PATENT OFFICE.

mrms MECHANISM.

Application filed February 18, 1926. Serial No. 89,050.

packages and the displacing and storing insuspended position of heavyweights and is also articularly adapted in one of its specific orms tothe carrying and operatin of life boats and analogous ship davit orerrick uses. Other objects will appear from the drawings andspecifications which follow These objects I accomplish by PI'OVldlIlg aboom having a controlling line reeved through its swinging end andthence through a block with one end of the line fixed to the boom, whilethe weight to be handled by my lifting mechanism 1s suspended from theblock. The weight is'lifted by pulling on the said line until the blockand therefore the weight is raised to its highest position, at whichtime the further pulling of the line raises the boom into upright orstored position. In this position, the boom may be latched and aloosening of the line then permits the weight to descend verticallyunder the new or upright position of the boom. In

this way a weight may be lifted from the street and placed on the bodyof the truck, or a life boat, launch or the like may be taken from thewater and placed on the deck of a ship. I I

A reverse operation enables, the weight to be lifted from the bed of thetruck and placed on the street, or from the deck ofda a visable however,to retain the boom slightly leaning from the vertical in its extreme upposition to facilitate its swinging outward first, before the weight islowered with respect to the boom end.

On the paying out of the'line while the boom is in a nearly verticalposition, the first tendency would be for the weight to descend with theline running through the blocks but where the boom initially. leanssufliciently or where a friction shoe or stop or looking member as setforth below, is employed to retard or prevent the line running throughthe blocks, the first movement will be an outward swinging of the boom.

I therefore prefer to provide a locking member for the line, whichpreferably comes into play only when the boom has swung from its finaldown position and is traversng an arc of movement and is approaching itsupright limit. a By referring to the accompanying draw- 1ngs myinvention will be made clear.

Fig. 1 is a side view of a conventional auttilruck to which my inventionhas been ig. 2 is a rear view of the apparatus of ig. 3 is a section ofFig. 1 on the line III-III thereof, and viewed in the direc tion of thearrows for the purpose of'illustrating the winding mechanism.

Fig. 4 is a detail showing of one form of clutc and power winding devicefor the mechanism of Fig. 1, and is an enlarged detail of afragmentary-portion thereof.

Fig. 5 is a fragmentary detail of one end of the boom in descendedposition, showing particularly the manner in. which the friction shoeclears the line.-

Flg. 6 is a similar to Fig. 5 except that the boom is in the up positionwith the shoe frictionally engaging the line.

Fig. 7 is similar to Fig. 6 except that the shoe has been released toallow the line to run freely through the blocks, while in the upposition. n

Figs. 8 and 9 are details of different forms of friction shoe.

Fig. 10 is an end view of my invention applied to the supporting,carrying and operating of life boats.

Fig. 11 is a side view of the parts shown in Fig. 10.

Fig. 12 is a detail of the end of the boom and standard when in theupright position, showing the operation ofthe friction shoe and Fig. 13is an end view of the boom of Fig. 12, in the descended position,showing the manner in which the friction shoe is auis reeved the line 9,and block and 00k 10,.

.the other end of the line 9 being fixed at 11 Y It is understood thatthe shaft 3 is adapted to be driven from the engine 2, through suitablereverse and different forward speed ratios as by the manipulation of thelever 18 as conventionally supplied in auto truck mechanism.

At 19 is a hook adapted to engage an eye 20 on the boom 7 to retain t hesame in the substantially upright position shown n Fig. 1 when thederrick mechanism is not being employed.

The boom as here shown is preferably of the U shape best indicated inF1g. 2.

At 21 is a friction member which I prefer to make of shoe form securedto the boom 7 in such a relation to the wheel 8 that the shoe is freefrom the line 9 when the boom is in a substantially downward positionand frictionally engages against the line 9 as the boom is raised.

This action is best shown in Figs. 5 and 6, wherein the shoe 21 issupported from the pivot 22 and fixed to the arm 7 with the bolt 23.This latter bolt I prefer to make removable so that the shoe 21 may bemoved from the position shown in Fig. 6 to the position shown in Fig. 7as by swinging about its second holding member 22. When so moved to theposition shown in Fig. 7 the shoe 21 is retained clear of the line 9,whereas when the bolt 23 is inserted and the boom raised from theposition ofFig. 5 to the position of Fig. 6 the shoe frictionallyengages the line 9, as shown in Fig. 6. e

A detailed front view of the shoe 21 is shown in Fig. 8, and analternate form of this shoe is shown at Fig. 9, wherein it is indicatedthat the line 9 wedges in the V shaped slot 22, thus more firmly holdingthe line 9 where such additional gripping is deemed advisable.

Referring particularly to Figs. 10 to 13, showing my invention adaptedto use with life boats, a pair of upright davit supports are indicatedat 30, 31, secured to the deck 32 and having pulley members 33, 34 attheir tops and pivots 35, 36 at the bottoms on which pivots are mountedrespectively the booms 37 38 fitted with top pulleys 39, 40respectively, through which are reeved the lines 41, 42 respectively.

Secondary pulleys 43, and 44 on the standards 30, 31 are employed forcarrying the line 42 thereover and down to the drum 45 which drum isadapted to be operated by the crank 46, the two lines 41, 42 being thusbrought on to the single drum 45.

It will now be seen that the rotation of the crank 46 will wind orunwind the lines 41, 42 of the respective booms 37, 38, raising andlowering the boat also and swinging the boat into stored position orover and clear of the side of-the deck 32.

The shoe 50 is provided as above described on each of the booms and ispreferably pivoted at 51 and locked by the removable bolt 52.

The operation is as follows:

Referring to Fig. 1, assuming that it is desired to lift a weight fromthe street on to the truck body 1, the boom is allowed to descend byunlocking the hook 19 and rotating the shaft 3 with the clutch engagedto rotate the drum 13 whereby the line 9 allows the boom 7 to descendfrom the full lineto the dotted line position.

The boom will swing out into the dotted position due to the frictionengagement between the shoe 21 and the line 9 instead of the block 10descending. As the boom descends the shoe 21 is released, but not untilsuch time as the arm 7 has attained an angular position which willinsure its further downward movement until it has arrived at the finalposition indicated in the dotted lines.

The weight here shown as the barrel is now raised by winding the line 9on the drum 13 by reversing the engine 2 through the action of the lever18. When the barrel is raised as high as it will go, block 10 engagesagainst the pulley 8 or the end of the boom 7 and the boom will thenswing upward from its dotted into its full lined posi tion carrying thebarrel with it.

When the full line position is reached the hook 19 is engaged with theeye 20 and the barrel may then be lowered on to the truck 21 by payingout the line 9 whose slight friction on the smooth surface of the shoe21 will not injure the line and will permit the barrel to descend whilethe boom is retained in its full line position by the hook 19.

The barrel will now rest on the truck body 1 and may be moved into anyposition desired or the barrel may be raised from the truck body 1 byreversing the above operation.

By releasing the bolt 23 and swin ing the shoe into the full lineposition of l ig. 7 if it be desired to remove the shoe friction. lVhilethe barrel is now raised with the boom 7 in the full line position ofFig. 1, the boom may be pushed out towards its dotted position as theline 9 is slowly unwound.

By swinging the barrel clear of the truck body and after the boom hasdeparted materially from the vertical, a further unwinding of the line 9will permit its descent until it engages on the stop 16 when furtherunwinding will result in the descending of the block 10 and thereforedelivering the barrel 51 on the street.

Referring particularly to Figs. 10 and 13, an unwinding of the drum 45will result in the booms 37, 38 first moving together and outward fromthe full line position of Fig. 10 to the dotted position whereby theboat 55 will swing clear of the ship 56 and when the booms have reachedtheir limiting down position a further unwinding of the drum 45 and thetwo lines 41, 42 will result in the bfiat descending to the wateralongside the s i l uring the downward movement of the booms from thefull line to the dotted position the shoe 50 has disengaged fromfrictional contact with the line 41 being free therefrom when the boom37 has reached the lower position of Fig. 13.

By the action of this shoe, it will now be seen that the line 41 doesnot run through the pulley wheel 39 except when the shoe is out 01engagement, that is when the boom is in the lower position of Fig. 13,or dotted position of Fig. 10 and when the boat is raised to the dottedpfls'itimi 55, a further winding of the drum 45 will result in theraising of the boom 1'; om the dotted to the -full line position and therestoration of the life boat in the davits as shown in full lines andwith the shoe in frictional engagement with the lines.

I claim:

1. Lifting mechanism of the character de scribed comprising a boompivoted to a support at one end and having a pulley at the other end, aline passing through said pulley and fixed to the said support adjacentsaid pulley, a block on said line between the pulley and said end, fixedmeans for winding said line through said pulley to raise or lower theboom and also the block, and a shoe member trictionally restraining theline from running through said pulley.

2. Lifting mechanism of the character de-' scribed comprising a boompivoted to a support at one end and having a pulley at t e other end, aline passing through said pulley and fixed to the said support adjacentsaid pulley, a block on said line between the pulley and said end, fixedmeans for winding said line through said pulley to raise or lower theboom and also the block, and a shoe member frictionally restraining theline from running through said pulley, a standard having an idler overwhich said line is reeved adjacent to said pulley when said pulley is inits upper position.

WILLIAM J. CONWAY.

